Year	%
1997	51.052383509765995
1998	79.7782984401309
1999	56.0000522394433
2000	91.6015457306105
2001	58.885130738807
2002	52.6544654204015
2003	41.0079893982542
2004	52.8426953271039
2005	53.343611045579294
2006	63.3830489161253
2007	103.90448956862299
2008	110.210055691371
2009	45.5683927888021
2010	65.4310966173029
2011	57.7818666883666
2012	40.3488054770033
2013	49.221954611072
2014	81.0130959862873